[Healeys] Rebuilt Engine Compression

[Kees Oudesluijs]

Did you check the firing order, camshaft timing, valve clearances? Does 
the distributor shaft turn when the engine is turning over?

Check the bypass wiring of the ballast resistor. Check the correct 
wiring of the coil, you would not be te first to have the polarity wrong.

The compression on a freshly rebuild engine is lower than on an engine 
that has been properly run in. It also depends on the tolerances and 
surface finishes used in the rebuild. Assuming that it is a proper 
rebuild the compression should not be an issue here. Whatever the 
compression the engine should start.

Timing and fuel cannot be spot on as the engine is not running and fine 
tuning of mixture and ignition should be made on a running engine.  It 
is however not an issue either as you set ignition initially statically 
as you do with the adjustment of the carbs and it should at least run on 
that.

Are the spark plugs wet or dry after churning? Try spraying some easy 
start fluid (mainly Aether) into the throat of the carbs during turning 
over and see if you get some life.  If so it is a fuel issue.

Good luck.


Kees Oudesluijs




Op 12-6-2023 om 07:41 schreef Patrick and Caroline Quinn via Healeys:
>
> Hello
>
> No amount of churning over with a new battery will induce the BN3’s 
> rebuilt engine to fire. Even towing the car up and down the road 
> failed to instill any life into the engine.
>
> Everything is spot on – timing, spark and fuel.
>
> Anyone have an idea as to what the compression be on a rebuilt engine 
> should be?
>
> Many thanks
>
> Patrick Quinn
>
> Blue Mountains, Australia
>
>
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